How to unsubscribe/unregister/delete BSNL Tunes (BSNL Caller Tune)

BSNL Caller tunes are the songs which the caller hears instead of ringing tone when calling. The tunes are available at the website http://bsnl.onmobile.com:9000/bsnltunes/Steps for removing BSNL Tunes (caller tune, hello tune) is as follows: